JAVA实验 URL网络程序设计.doc

实验六：URL网络程序设计实验目的：掌握URL类的使用：URL的概念和编程。实验要求：1、掌握网络编程的基本概念。2、掌握URL类的简单应用。3、利用URL类与URLConnection类获取资源。实验内容：1、用Java实现底层网络通讯下面的语句利用主机名找到网络中相应的计算机的IP地址并打印出来。程序中用到了InetAddress类，它主要用来区分计算机网络中的不同节点，即不同的计算机并对其寻址。import java. net.*；public class MyIpAdress public static void main(String args) /String s1=new String(“lab9”);tryif(arg.Length=1)InetAdress ipa=InetAddress.GetByName(args0)；System.Out.println(”Host name：”+ip.GetHostName();System.out.println(“Host IP Address:”+ip.toString();System.out.println(“Local host:”+InetAddress.getLocalHost(); else system.out.println(“Error,except a hodtname as commandine parameter.”); catch(UnknownException e) system.out.println(e.toString(); 编译并运行程序。2、获取URL信息，源代码如下：import .*; import java.io.*; public class URLTest public static void main(String args) URL url=null; InputStream is; try url=new URL(http:/localhost/index.html); is=url.openStream(); int c; try while(c=is.read()!=-1) System.out.print(char)c); catch(IOException e) finally is.close(); catch(MalformedURLException e) e.printStackTrace(); catch(IOException e) e.printStackTrace(); System.out.println(文件名:+url.getFile(); System.out.println(主机名:+url.getHost(); System.out.println(端口号:+url.getPort(); System.out.println(协议名:+url.getProtocol(); 编译并运行程序。3、利用URL类获取网络资源，源代码如下：import .*; import java.io.*; public class URLReader public static void main(String args) throws Exception URL web = new URL(50:2222/); BufferedReader in = new BufferedReader(new InputStreamReader(web.openStream(); String inputLine; while (inputLine = in.readLine() !=null)System.out.println(inputLine); in.close(); 编译并运行程序。4、利用URLConnection对URL资源的读取，源代码如下：import .*; import java.io.*; public class URLConnectionReader public static void main(String args) throws Exception URL web = new URL(50:2222/); URLConnection webc=web.openConnection(); /get an instance of URLConnection BufferedReader in = new BufferedReader(new InputStreamReader( webc.getInputStream(); /use ofURLConnection String inputLine; while (inputLine = in.readLine() != null) System.out.println(inputLine); in.close(); 编译并运行程序。5、掌握URLConnection对URL资源的写入，源代码如下：import java.io.*; import .*; public class Reverse public static void main(String args) throws Exception if (args.length != 1) System.err.println(Usage: java Reverse string_to_reverse); System.exit(1); String stringToReverse=args0; URL url = new URL(/cgi-bin/backwards); URLConnection connection = url.openConnection(); connection.setDoOutput(true); PrintWriter out = new PrintWriter(connection.getOutputStream(); out.println(string= + stringToReverse); out.close(); BufferedReader in = new BufferedReader(newInputStreamReade